Volcanoes Answers

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1
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Which statement describes convergent boundaries?

A
Rifts form.
B
Subduction occurs.
C
Plates push away from each other.
D
Mid-ocean ridges mark locations.
2
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Which event causes a volcanic eruption?

A
magma turning into lava
B
water being heated by magma
C
explosions occurring in magma chambers
D
magma cutting through older rocks
3

Which phrase describes a sill?

A
fills in valleys and rivers
B
is a hardened magma intrusion
C
cuts vertically through older rock layers
D
is built up by numerous eruptions over thousands of years
4

The image shows Osorno in Chile, which last erupted in 1869.

Question illustration
A
shield volcano
B
active volcano
C
dormant volcano
D
explosive volcano
5

Which feature forms at a divergent boundary?

A
rift valley
B
island arc
C
subduction zone
D
collision zone
6

Which statement explains what happens as magma rises inside a volcano?

A
Gases will contract in the chamber.
B
The pressure of the gas will disappear.
C
The magmatic pressure decreases.
D
Magma moves to other chambers.
7

A volcano erupts, and lava flows down a mountainside. Which statement best describes this eruption?

A
This is a quiet eruption caused by low-viscosity magma.
B
This is an explosive eruption caused by high-viscosity magma.
C
This is a quiet eruption with lava spewing out violently.
D
This is an explosive eruption during which gases bubble out gently.
8

A volcano erupts, and lava flows down a mountainside. Which statement best describes this eruption?

A
This is a quiet eruption caused by low-viscosity magma.
B
This is an explosive eruption caused by high-viscosity magma.
C
This is a quiet eruption with lava spewing out violently.
D
This is an explosive eruption during which gases bubble out gently.
9

Which phrase describes a lava plateau?

A
steep-sided mountain
B
gently sloping mountain
C
hardened magma in a pipe
D
volcanic material in valleys
10

Which statement explains what happens as magma rises inside a volcano?

A
Gases will contract in the chamber.
B
The pressure of the gas will disappear.
C
The magmatic pressure decreases.
D
Magma moves to other chambers.
11

Erosion and deposition constantly change Earth’s surface. Erosion carries natural materials like rock and soil from one place to another. Through deposition, these natural materials may be deposited in areas where they build up over time.

A
sill
B
mud pot
C
caldera
D
lava plateau
12

Which feature is created on the exterior of a volcano when it erupts?

A
magma chamber
B
crater
C
hot spot
D
boundary
13

Mount St. Helens is a volcano that erupted with great force in 1980. Which phrase best describes this eruption?

A
quiet eruption
B
gentle lava flows
C
magma low in silica
D
high-viscosity magma
14

A volcano that has not erupted in a very long time suddenly has a plume of steam coming from it. Which best describes this volcano?

A
was dormant and is now active
B
was quiet and is now active
C
was extinct and is now explosive
D
was dormant and is now explosive
15

Which statement describes convergent boundaries?

A
Rifts form.
B
Subduction occurs.
C
Plates push away from each other.
D
Mid-ocean ridges mark locations.
16

The image shows the locations of volcanoes around the world.

Question illustration
A
Many volcanoes are on the eastern coast of Asia.
B
Most volcanoes are in the center of continents.
C
No volcanoes are found in the middle of the ocean.
D
Many volcanoes are on the eastern coasts of North and South America.
17

The photo shows Old Faithful in Yellowstone National Park.

Question illustration
A
It is a caldera formed from a vent collapsing.
B
It is a mud pot formed from pools of boiling, acidic mud.
C
It is a volcanic neck that formed as a result of magma that never erupted.
D
It is a geyser that formed due to water heated by magma erupting at Earth’s surface.
18

Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet
19

Which feature forms at a divergent boundary?

A
rift valley
B
island arc
C
subduction zone
D
collision zone
20

The image shows Osorno in Chile, which last erupted in 1869.

Question illustration
A
shield volcano
B
active volcano
C
dormant volcano
D
explosive volcano

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